The Best UK reviews sites are often specialist websites which have built a community of reviewers. The shopping comparison sites like Kelkoo have reviews, ratings and good introductory buyers guides, but the number of reviews is often patchy. So, here I concentrate on review intermediaries.

• Reviewcentre review site - a site with a good level of reviews in many categories
• Reevoo review site - focuses on hardware and electronic reviews for the UK. 
• Crowdstorm review site - as well as the normal reviews, this site categorises buzz around product categories like mobile phones. A nice concept, but the design of the site doesn't really do it for me - I don't understand how the buzz is measured. A site launched by one of the founders of Kelkoo.

how review sites should be used by marketers

For online product marketers, identifying the relevant reviews sites or online intermediaries in their sector is one aspect of situation analysis. It gives them the customer feedback on products and they may contribute to discussions - not in a disguised way, but in an open way.

The top reviews sites in the UK according to google are  

book review site
book review sites
book review website
camera review site
camera review sites
camp site reviews
car review sites
caravan site reviews
dating site review
dating site reviews
dating sites review